condition mean min max ZT0-3 31.106541 31.106541 31.106541 ZT4-7 38.868677 38.868677 38.868677 ZT8-11 52.6825405 52.6825405 52.6825405 ZT12-15 38.622314 38.622314 38.622314 ZT16-19 71.576515 71.576515 71.576515 ZT20-23 58.364687 58.364687 58.364687